fix importing and exporting Session objects from/to CSV and Excel#802

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alixdamman wants to merge 8 commits intolarray-project:masterfrom

alixdamman:session_to_csv_excel

Commits on Aug 30, 2019

fix #803 :
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Commits on Sep 2, 2019

fix #804 : removed trailing NaNs and None values when extracting Axis and Group objects from __axes__ and __groups__ special sheets/csv files
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(issue 805): anonymous and/or wildcard axes are handled correctly when using Session.save() and Session.load()
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(issue 805) updated LArray.to_frame(): call AxisCollection.display_names property at the beginning to to make LArray.to_frame() consistent with LArray.dump() (and then to make it possible to handle…
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(issue 805) updated from_frame(): parse each axis name to check it represents an anonymous and/or wildcard axis
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(issue 805): added changelog
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improved unit tests for Session objects
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skip testing dtype in _test_io() if Python 2.7
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